@Nighthiker What material are the laces? Of all the shoes and boots I've worn some kinds of lace wouldn't stay tight if I glued them.
Even with a lot of bushwhacking my long pants cover the laces enough that I don't get all kinds of debris in them. If anything rubs against them it's my pants.
After trying three different kind/brand of gaiters and not liking them much, I made my own open-back leather chaps. They have a strap & snap at the bottom that hooks through the lowest lace in my boots to keep them on straight, which keeps the thick and thorny stuff away from the laces.